New generate config task from Pleroma upstream & move tasks namespace

Little fixes and tests

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mix/tasks/mobilizon/common.ex

@@ -0,0 +1,28 @@
+# Portions of this file are derived from Pleroma:
+# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
+# SPDX-License-Identifier: AGPL-3.0-only
+# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/mix/tasks/pleroma/common.ex
+
+defmodule Mix.Tasks.Mobilizon.Common do
+  @moduledoc "Common functions to be reused in mix tasks"
+
+  def get_option(options, opt, prompt, defval \\ nil, defname \\ nil) do
+    display = if defname || defval, do: "#{prompt} [#{defname || defval}]", else: "#{prompt}"
+
+    Keyword.get(options, opt) ||
+      case Mix.shell().prompt(display) do
+        "\n" ->
+          case defval do
+            nil -> get_option(options, opt, prompt, defval)
+            defval -> defval
+          end
+
+        opt ->
+          opt |> String.trim()
+      end
+  end
+
+  def escape_sh_path(path) do
+    ~S(') <> String.replace(path, ~S('), ~S(\')) <> ~S(')
+  end
+end